I used to play a game called Aura Kingdom. The game was running fine on Catalyst drivers (I had 7970 at the time).
A week ago, I purchased a new PC with 390X, installed the new drivers (Crimson) and launched the game. The game was running just horribly (fps drops, stuttering etc..).
My first guess was to just downgrade to older drivers but if I did that, the new games wouldn't run well.
Any plans to fix the issue without downgrading the drivers?
What are your CPU/GPU temperatures like?
I would consider performing a clean installation of Windows then, as it's not expected behaviour.
1. Clean Install Windows.
2. Fully update Windows installing all updates.
3. Install Crimson 184.108.40.206
4. Test performance
5. Install other software, antivirus etc.
Following those steps should rule out any OS problems.
Likely caused by hardware then, you need to test each piece of hardware in your system to determine the fault. I would start by trying the GPU in a different system with a different power supply.